But it does feels like an alien technologies, in a way that its alien to us. Its good that we had Pyramids to try to rediscover it. But i wonder how much else is out there hidden, forgotten, alien to us?

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I think anyone who is a science-fiction fan wants to believe.

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As an sf fan I want to believe in a far more interesting universe than in "aliens" who travel interstellar distances simply to move stones around and shove probes up the locals' asses.

In fact the world I encounter outside my front door every morning is more marvelous, unexpected and inspiring than that.

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I was talking about extraterrestrial life in general.

I agree that they would probably have more interesting things to do than push boulders around for a lesser life form.

The most likely solution to the Fermi paradox is either that abiogenesis is very hard/rare (which is heavily supported by the staggering complexity of the simplest molecule that can reliably self-replicate) or that technological intelligence is very hard to evolve.

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Or terraforming is a hell of a difficult task and these civilizations didn't manage.
Or they colonised our galaxy, but our biosphere was toxic to them so they skipped it because sterilizing a planet was immensely more difficult than terraforming one.
Or our biosphere was toxic to them and they died.
Or they sterilised every place they found, so only those who didn't encounter them survived.
Or they had ethical concerns regarding coming here.
Or they prefer red dwarves because of their longer life.
Or they prefer O'Neill colonies around rogue gas giants where they harvest fuel for fusion.
Or they calculated a more efficient way for survival.
Or the time scales for galactic colonisation are largely exaggerated.
Or the development always needs a few billion years at least, and we are one of the first.
Or their planets became uninhabitable before they reached space.
Or Congress never got to approving the funds for an interstellar mission.
Or they waited too long and their civilizations went into a decline.
Or they actually have a subsurface civilization on Mercury and Enceladus right now.

Or all of the above.

I fail to see how can something be a paradox when it relies on too many assumptions in the first place.

The Fermi paradox:
If only one species masters interstellar flight (NOT FTL, but BELOW LIGHTSPEED flight), then this species will easily colonise the entire galaxy within 100 million years. Also - after it spreads to ~10 solar systems, this species is all but indestructible - no catastrophe can extinguish it any longer.

Well, our galaxy is ~13,6 billion years old - but only since ~6 BILLION years there were enough heavy elements for life to be able to form.
In ~6 BILLION years, if ET advocates are to be believed, many, many intelligent species have arisen. But these advocates always have trouble explaining why none of them managed to send the first few interstellar ships - a feat humanity is close to accomplish (a few hundred/thousand years is a mere blink of cosmic time).
EVERY SINGLE ONE of these species - all the factions with different agendas and actions each species was composed of - always conveniently went extinct or 'insert another solution to the Fermi paradox that badly breaks Occam's razor'.

The most likely solution to the Fermi paradox is either that abiogenesis is very hard/rare (which is heavily supported by the staggering complexity of the simplest molecule that can reliably self-replicate) or that technological intelligence is very hard to evolve.

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Or terraforming is a hell of a difficult task and these civilizations didn't manage.
Or they colonised our galaxy, but our biosphere was toxic to them so they skipped it because sterilizing a planet was immensely more difficult than terraforming one.
Or our biosphere was toxic to them and they died.
Or they sterilised every place they found, so only those who didn't encounter them survived.
Or they had ethical concerns regarding coming here.
Or they prefer red dwarves because of their longer life.
Or they prefer O'Neill colonies around rogue gas giants where they harvest fuel for fusion.
Or they calculated a more efficient way for survival.
Or the time scales for galactic colonisation are largely exaggerated.
Or the development always needs a few billion years at least, and we are one of the first.
Or their planets became uninhabitable before they reached space.
Or Congress never got to approving the funds for an interstellar mission.
Or they waited too long and their civilizations went into a decline.
Or they actually have a subsurface civilization on Mercury and Enceladus right now.

Or all of the above.

I fail to see how can something be a paradox when it relies on too many assumptions in the first place.

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Your alternative to "they just don't exist" badly fails Occam's razor. Your assumptions are both far more improbable and far more numerous. That's why the Fermi paradox is a paradox:

Which congress didn't approve interstellar missions? All the congresses belonging to all the hundreds/thousands of civilizations that a single species will create during its history?
All the leadership apparatuses that lead every single species which existed? Talk about uniformly minded aliens - aren't they supposed to be phychologically and physiologically very different?

All these very different species, evolved with different psychologies, different cultures didn't have the curiosity/waited too long/went into decline? Talk about improbable.

Why terraform? Build O'Neill colonies or Banks' orbitals.
Of course, if you want to terraform due to a quirk of yours, you can - we KNOW it can be done; it only takes a lot of time.

If they colonized entire solar systems, we should be able to see the reflective surfaces/megascale constructions/etc/in nearby systems, even relatively small scale alterations - for some time now.
If only one of these many species colonized the entire galaxy - aka they had the capability and time to do it - we should definitely see them, their other achievements.
But the galaxy, we observe, is virgin, untouched by intelligence in all its details we see.

Unless all these species, much like unicorns and fairies, are always hiding - all having the same imperative at not being seen (building subsurface civilizations on wherever). Yet again, improbable.

100 million years is MORE than enough time to colonize the galaxy with ships only able of 0,1 lightspeed - 100 times more, to be exact. Life could have formed in the galaxy since 6 BILLION years ago.
Enough time to colonize the galaxy many, many times over - by many, many species. And none of these species can just disappear - there's no disaster that can do that, short of another galactic species - which will remain in the galaxy.

I fail to see how can something be a paradox when it relies on too many assumptions in the first place.

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Not nearly as many "assumptions" as you made in that post trying to refute it, however.

The simplest and most likely reason for the complete lack of evidence of other civilizations as we understand the term is that they're not there. Anything else is speculative and, yes, assumes things that are not in evidence.

You can't fail the Occam's razor, it's not a rule that's always true, just a rule to use when you have no other. Every scientific discovery we have ever made has failed the Occam's razor at the time. Badly. If they didn't, there would be no use for science.

No matter how unlikely those scenarios are, each of them is decreasing the probability of the limited choice that either aliens aren't there or we would have met them. It is a false dichotomy – all the insignificant scenarios add up to something significant enough to not be ignored as an option.

There are millions of reasons why we wouldn't meet aliens even if they were all over the place, from insufficient telescope resolution to looking at the wrong places to pure chance.

One thing that would seem reasonable to expect is that if two civilizations became aware of each other, one of them would go extinct or one of them will push the other ahead, either by giving them technology directly or at least by inspiring them, thus transforming them into a more advanced one. The latter option might mean that the two civilizations merge, at least technologically.

That's kinda cool and funny, because under those assumptions there is a uncanny similarity between the expectation to be born in a civilization that has met aliens and a civilization that is in its middle age. Not only both assumptions are a result of your expectation to be average (and be outran by those aliens that you'd be meeting), but actually meeting them could transform you from a toddler stage to a middle aged one in a few centuries.

Both even seem logically equivalent, which means that we should expect to be extinct in a few hundred thousand years for much the same reason we expect that aliens are rare.

Valid conclusions actually, as long as the probability of experiencing each moment in the history of the universe is the same or very similar. What if the universe becomes more unlikely with each day, though? Say, for example that the multi-world interpretation of quantum mechanics is “true” and most “timelines” suffer from some kind of catastrophic event that leave the interesting ones more and more unlikely? Anything like this would be completely unobservable and unmeasurable by us, and I'm not completely convinced that it would be the more complex option that necessarily violates Occam's razor – we know nothing about the universe as an object, and we most likely never will.

100 million years is more than enough time to colonize the galaxy with ships only able of 0,1 lightspeed.

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What are the energy requirements for that? Is the time necessary to rebuild the civilization at the next star system taken into account, which at 0.1 lightspeed is probably a couple of orders of magnitude larger than the travel time, and speeding it up would further increase the energy requirements for the trip?

If I could get rid of any two "laws" frequently cited on the Internet, they would definitely be Godwin's Law, and yes, Occam's Fucking Razor. "This explanation is complex, therefore it is wrong!" It encourages the absolute worst varieties of intellectual laziness.

You can't fail the Occam's razor, it's not a rule that's always true, just a rule to use when you have no other. Every scientific discovery we have ever made has failed the Occam's razor at the time. Badly. If they didn't, there would be no use for science.

No matter how unlikely those scenarios are, each of them is decreasing the probability of the limited choice that either aliens aren't there or we would have met them. It is a false dichotomy – all the insignificant scenarios add up to something significant enough to not be ignored as an option.

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Occam's razor is a scientifical law, not an 'internet law'.
Is says that the simplest explanation is likely - aka most often, correct.
And "every scientific discovery we have ever made" did not fail Occam's razor badly. NOT EVEN CLOSE - in most cases, the scientific breakthrough presented a simpler way to account for the observed phenomena.

In the case of Fermi's paradox, the simplest explanation is that abiogenesis is very rare, followed by evolution of intelligence is very rare.

You want to believe very improbable "explanations" based on truck loads of assumptions?
Be my guest. Doesn't change the fact of them being improbable.

There are millions of reasons why we wouldn't meet aliens even if they were all over the place, from insufficient telescope resolution to looking at the wrong places to pure chance.

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Only if ALL - EVERY SINGLE ONE - of the aliens are hiding, are at most at our stage of evolution, etc. Your statement is implied assumptions central.

Valid conclusions actually, as long as the probability of experiencing each moment in the history of the universe is the same or very similar. What if the universe becomes more unlikely with each day, though? Say, for example that the multi-world interpretation of quantum mechanics is “true” and most “timelines” suffer from some kind of catastrophic event that leave the interesting ones more and more unlikely?

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Really? You actually go all the way to these assumptions? You could just as well say 'the sun will not rise tomorrow', because 'the sun will rise tomorrow' is merely an inference, not 100% correct.

The VERY small likelihood of such statements makes them a waste of time.
These assumptions are supposed to have anything resembling validity? More like being practically impossible - the chance of them being true being so small as to be only a mathematical abstraction.

100 million years is more than enough time to colonize the galaxy with ships only able of 0,1 lightspeed.

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What are the energy requirements for that? Is the time necessary to rebuild the civilization at the next star system taken into account, which at 0.1 lightspeed is probably a couple of orders of magnitude larger than the travel time, and speeding it up would further increase the energy requirements for the trip?

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As said:
"100 million years is MORE than enough time to colonize the galaxy with ships only able of 0,1 lightspeed - 100 times more, to be exact."

The galaxy is ~100.000 lightyears across. At 0,1 lightspeed, traversable in 1 million years. Leaving 99 MILLION years for civilisation-building in the new colonies.
As said, MORE than enough time.

As for the energy requirements, today we have the technology to accelerate to 0,05 lightspeed and decelerate to 0: fission fragment rockets, powering a starship of ~normal size (achievable if we were mining the asteroids).

If I could get rid of any two "laws" frequently cited on the Internet, they would definitely be Godwin's Law, and yes, Occam's Fucking Razor. "This explanation is complex, therefore it is wrong!" It encourages the absolute worst varieties of intellectual laziness.

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I guess Karl Popper and many other philosophers of science, philosophers, scientists were 'intelectually lazy', eh?

And Occam's razor is ~"This explanation is MORE complex, therefore it is LIKELY wrong!"

If I could get rid of any two "laws" frequently cited on the Internet, they would definitely be Godwin's Law, and yes, Occam's Fucking Razor. "This explanation is complex, therefore it is wrong!" It encourages the absolute worst varieties of intellectual laziness.

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I guess Karl Popper and many other philosophers of science, philosophers, scientists were 'intelectually lazy', eh?

And Occam's razor is "This explanation is MORE complex, therefore it is LIKELY wrong!"

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The problem is people who don't know what they're talking about falling back on mental "crutches" like those. "You mentioned Hitler/Nazis! You are automatically wrong!" "You gave a complex explanation! You are automatically wrong!" It's irritating as all hell.

I have to agree with Rob. Occam's razor is so very often misused it's not even funny. And I say misused because as a general principle of logic, it's basically sound, but those that use it most often usually fail to understand what it actually means or in what context it is meant to be applied and just use it to prop up a straw man argument or try to shift the burden of proof.

They also fail to appreciate that it's a philosophy and not a fundamental law of the universe.

I ask you, what is the simplest explanation for where babies come form? An efficient and discrete avian based delivery system, or a series of complicated biochemical interactions based on billions of years of cellular evolution through an essentially random and chaotic process of natural selection? The stork idea is certainly simpler, but does invoking Occam's razor make it correct? Of course not.

Now, the Fermi Paradox is a different matter, as it boils down to "either aliens don't exist or they would have been proved to have come to Earth." A way of thinking that itself falls victim to Occam's Razor once you start thinking about it...

If I did not know better, I would assume you were one of those people completely clueless about how big the universe really is. Hell, just on our tiny planet how long did Native Americans go before they saw any evidence of other people from other continents? Some time. When we multiply that scale by a nearly unfathomable number and couple that with the fact that we have only taken one or two figurative steps into space, the answer to your question is rather obvious.

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I was making the point that if the assumptions being made were commonplace (life->complex life->intelligent life->space exploration->FTL travel) then we'd see it everywhere because it's had ~15 billion years to develop. The Milky Way alone would have many thousands if not millions of intelligent species. That we have seen absolutely no evidence of this indicates that intelligent, technologically advanced, spacefaring life is either quite rare or not contemporaneous.

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Hell, life in general could exist on a few million planets in the milky way while we have yet to look at or detect any one of them. Who is to say how common place it is for intelligent life to develop FTL (making the rather larger assumption that such a thing is possible)?

I agree that your question would apply if the claim was that life which can travel faster than light is common place and that such travel is so much faster than the speed of light that they could travel to any point in the universe (or galaxy if we confine things to the Milky Way) in a short period of time at relatively low cost/expenditure. But even in such a case, would the FTL races have time or desire to visit everyone? What if there are billions of different planets in the universe with life? Would they get to them all? How many races have FTL ability? 1/100th? 1/1000th? Fewer? And this is all assuming such technology does exist.

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I simply proceed from an assumption of space travel that doesn't break the known laws of physics..that even includes using wormholes, which would require more power than we know of to open or travel through.

I was making the point that if the assumptions being made were commonplace (life->complex life->intelligent life->space exploration->FTL travel) then we'd see it everywhere because it's had ~15 billion years to develop. The Milky Way alone would have many thousands if not millions of intelligent species. That we have seen absolutely no evidence of this indicates that intelligent, technologically advanced, spacefaring life is either quite rare or not contemporaneous.

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Hell, life in general could exist on a few million planets in the milky way while we have yet to look at or detect any one of them. Who is to say how common place it is for intelligent life to develop FTL (making the rather larger assumption that such a thing is possible)?

I agree that your question would apply if the claim was that life which can travel faster than light is common place and that such travel is so much faster than the speed of light that they could travel to any point in the universe (or galaxy if we confine things to the Milky Way) in a short period of time at relatively low cost/expenditure. But even in such a case, would the FTL races have time or desire to visit everyone? What if there are billions of different planets in the universe with life? Would they get to them all? How many races have FTL ability? 1/100th? 1/1000th? Fewer? And this is all assuming such technology does exist.

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Oh, but to hear some tell it, any civilization that gets near our level of development will inevitably reach the Singularity, which promises technologies we can't even imagine. At a minimum, there should be Von Neumann probes everywhere, since those are so easy and cheap to build.

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Or they have other concerns...if they aren't lonely, if they don't need our resoruces, what are they doing? In a multi-species race for nearly unlimited resources of a black hole at galactic center? Exploring time/multiverses? Exploring endless permutations of a superintelligent AI lifespan?

Sadly, there is no evidence. On the other hand, as exponentially advancing as our technology is, we may also be sadly inadequate to the task of knowing for, oh at least a few decades if not longer..

I ask you, what is the simplest explanation for where babies come form? An efficient and discrete avian based delivery system, or a series of complicated biochemical interactions based on billions of years of cellular evolution through an essentially random and chaotic process of natural selection? The stork idea is certainly simpler, but does invoking Occam's razor make it correct? Of course not.

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Your 'avian delivery system' fails to coherently explain where babies come from - by a large margin (so, how do these birds get those children?). As such, it's not a viable explanation - not even close.

In science, Occam's razor is used as a heuristic (general guiding rule or an observation) to guide scientists in the development of theoretical models rather than as an arbiter between published models.[9][10] In the scientific method, Occam's razor is not considered an irrefutable principle of logic, and certainly not a scientific result.

I ask you, what is the simplest explanation for where babies come form? An efficient and discrete avian based delivery system, or a series of complicated biochemical interactions based on billions of years of cellular evolution through an essentially random and chaotic process of natural selection? The stork idea is certainly simpler, but does invoking Occam's razor make it correct? Of course not.

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Your 'avian delivery system' fails to coherently explain where babies come from - by a large margin (so, how do these birds get those children?). As such, it's not a viable explanation - not even close.

Hell, life in general could exist on a few million planets in the milky way while we have yet to look at or detect any one of them. Who is to say how common place it is for intelligent life to develop FTL (making the rather larger assumption that such a thing is possible)?

I agree that your question would apply if the claim was that life which can travel faster than light is common place and that such travel is so much faster than the speed of light that they could travel to any point in the universe (or galaxy if we confine things to the Milky Way) in a short period of time at relatively low cost/expenditure. But even in such a case, would the FTL races have time or desire to visit everyone? What if there are billions of different planets in the universe with life? Would they get to them all? How many races have FTL ability? 1/100th? 1/1000th? Fewer? And this is all assuming such technology does exist.

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Oh, but to hear some tell it, any civilization that gets near our level of development will inevitably reach the Singularity, which promises technologies we can't even imagine. At a minimum, there should be Von Neumann probes everywhere, since those are so easy and cheap to build.

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Or they have other concerns...if they aren't lonely, if they don't need our resoruces, what are they doing? In a multi-species race for nearly unlimited resources of a black hole at galactic center? Exploring time/multiverses? Exploring endless permutations of a superintelligent AI lifespan?

Sadly, there is no evidence. On the other hand, as exponentially advancing as our technology is, we may also be sadly inadequate to the task of knowing for, oh at least a few decades if not longer..